Leakage Current Sensor ASIC Closed-Loop Feedback
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Solution Overview
Problem
Traditional leakage current sensors have low power density, are bulky, costly, and suffer from low precision amplification with noise introduction, making them unsuitable for miniaturization and portability, and lack essential safety features like self-checking and over-temperature protection.
Innovation Solution
A portable leakage current sensor utilizing an ASIC chip with a digital signal processing module, a current sampling unit, and a reference unit, enabling closed-loop feedback, programmable gain output, bidirectional communication, and safety features like self-checking and over-temperature protection, integrated with an annular magnetic core for improved power density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If traditional closed-loop flux gate sensors are used, then leakage current sensing is achieved, but power density is low and structure is cumbersome
Solution Approach 1:
The patent replaces the traditional mechanical/closed-loop flux gate structure with an open-loop magnetic core combined with ASIC chip-based digital signal processing. This substitution eliminates the need for complex mechanical adjustments and closed-loop feedback mechanisms, achieving higher power density and simpler structure while maintaining sensing accuracy.
Solution Approach 2:
The patent changes the operating parameters by using digital signal processing instead of analog amplification. The ASIC chip performs digital calibration and error compensation, transforming the sensing system from analog-based to digital-based operation, which improves power efficiency and reduces structural complexity.
2Measurement precision
If analog amplification circuit is installed to amplify sampling current, then current measurement is achieved, but precision is low and noise is introduced
Solution Approach 1:
The patent substitutes analog amplification circuits with digital signal processing performed by the ASIC chip. The sampling current is converted to digital signals and processed digitally, eliminating the noise introduction inherent in analog amplification while maintaining measurement precision through digital calibration and error compensation.
Solution Approach 2:
The patent implements digital feedback mechanisms where the ASIC chip performs repeated calibration by setting the same reference current value and reading fed-back digital quantity signals. This feedback loop enables error compensation and mapping between analog and digital quantities, improving measurement precision without introducing noise.
3Volume of moving object
If traditional leakage current sensor design is used, then sensing function is provided, but miniaturization and portability are difficult to achieve
Solution Approach 1:
The patent merges multiple functions into a single integrated ASIC chip, combining current sensing, digital signal processing, calibration, and error compensation functions. This integration dramatically reduces the sensor volume while maintaining full functionality, enabling miniaturization and improved portability.
Solution Approach 2:
The ASIC chip serves multiple functions simultaneously: it acts as an analog-to-digital converter, performs digital signal processing, conducts repeated calibration, implements error compensation, and provides bidirectional communication. This multi-functionality reduces the overall system complexity and volume, facilitating miniaturization.
4Reliability
If safety features like self-checking and over-temperature protection are added, then reliability is enhanced, but device complexity increases
Solution Approach 1:
The patent integrates safety features such as self-checking and over-temperature protection directly into the ASIC chip, merging them with the main sensing and processing functions. This integration enhances reliability without significantly increasing external circuit complexity, as the safety functions are implemented within the same integrated circuit.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides high precision, adjustable current measurement, reduced noise, enhanced safety, and portability, with programmable gain output and bidirectional communication, effectively addressing the limitations of traditional sensors.
Implementation Method 1
an annular magnetic core for improved power density
Implementation Method 2
the input end of the leakage current sensor comprises a current sampling unit
Data Source
AI summary
A leakage current sensor and a leakage current monitoring device; the leakage current center comprising an input end, an output end and an ASIC chip; the ASIC chip is electrically connected with the input end for reading analog quantity signals of the input end; the ASIC chip is further electrically connected to a digital signal processing module; the digital signal processing module can output digital quantity signals to the output end; the digital signal processing module can simultaneously feedback the output digital quantity signals to the ASIC chip, thereby forming a closed-loop feedback circuit; the input end of the leakage current sensor comprises a current sampling unit; a reference unit is arranged between the current sampling unit and the ASIC chip.